4WD Shift Switch
4WD Shift SwitchCONSULT-II REFERENCE VALUE IN DATA MONITOR MODE:
TRANSFER CONTROL UNIT TERMINALS AND REFERENCE VALUE:
DIAGNOSTIC PROCEDURE
1. CHECK 4WD SHIFT SWITCH SIGNAL
With CONSULT-II
1. Turn ignition switch "ON".
2. Select "DATA MONITOR" mode for "ALL MODE AWD/4WD" with CONSULT-II.
3. Read out ON/OFF switching action of the "2WD SWITCH", "4H SWITCH", "4L SWITCH" with operating 4WD shift switch.
Without CONSULT-II
1. Turn ignition switch "ON".
2. Check voltage between transfer control unit harness connector terminals and ground.
OK or NG
OK >> GO TO 5.
NG >> GO TO 2.
2. CHECK 4WD SHIFT SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
2. Disconnect 4WD shift switch harness connector.
3. Check voltage between 4WD shift switch harness connector terminal 1 and ground.
4. Turn ignition switch "ON". (Do not start engine.)
5. Check voltage between 4WD shift switch harness connector terminal 1 and ground.
OK or NG
OK >> GO TO 3.
NG >>
1. Check harness for short or open between 4WD shift switch harness connector terminal 1 and transfer shut off relay 2 harness connector E157 terminal 5 and 10A fuse (No. 58 located in the fuse and relay box). If any items are damaged, repair or replace damaged parts.
2. Perform trouble diagnosis for power supply circuit. Refer to TF-51, "Power Supply Circuit For Transfer Control Unit". Power Supply Circuit For Transfer Control Unit
3. CHECK HARNESS BETWEEN 4WD SHIFT SWITCH AND TRANSFER CONTROL UNIT
1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
2. Disconnect transfer control unit harness connector and the 4WD shift switch harness connector.
3. Check continuity between the following terminals.
- Transfer control unit harness connector M152 terminal 14 and 4WD shift switch harness connector M141 terminal 3.
- Transfer control unit harness connector M152 terminal 15 and 4WD shift switch harness connector M141 terminal 5.
- Transfer control unit harness connector M152 terminal 16 and 4WD shift switch harness connector M141 terminal 6.
Continuity should exist.
Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 4.
NG >> Repair or replace damaged parts.
4. CHECK 4WD SHIFT SWITCH
1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
2. Remove 4WD shift switch harness connector.
3. Operate 4WD shift switch and check continuity between 4WD shift switch terminals.
OK or NG
OK >> GO TO 5.
NG >> Replace 4WD shift switch.
5. CHECK TRANSFER CONTROL UNIT
Check transfer control unit input/output signal.
OK or NG
OK >> GO TO 6.
NG >> Check transfer control unit pin terminals for damage or loose connection with harness connector. If any items are damaged, repair or replace damaged parts.
6. CHECK DTC
Perform the self-diagnosis, after driving a vehicle for a while.
OK or NG
OK >> Inspection End.
NG >> Replace transfer control unit.
COMPONENT INSPECTION
1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
2. Remove 4WD shift switch harness connector.
3. Operate 4WD shift switch and check continuity between 4WD shift switch terminals.
4. If NG, replace the 4WD shift switch.